This instrumentation circuit was found in the September 1989 Radio Electronics magazine. The circuit uses an analog indicator and the power supply must be symmetrical.
The circuit shown in the figure can be used to connect a loudspeaker to an amplifier only after...
The circuits shown below consist of diode protections against accidental polarity reversal in the supply...
This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be...